Improvement in automatic steam-hammers



A are' required.

ltwo distinct exhaust-ports on the valve-seat,

UNITED STATES COLEMAN SELLERS, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN AUTOMATIC STEAM-HAMMERS.

Specification forming part of Letters Patent No. 132,374, dated October 22, 1872. v

To all whom it may concern.'

Be it known that I, COLEMAN SELLERS, of the city of Philadelphia, in the State of Pennsylvania, have invented certain Improvements in Automatic Steam-Hammers, of which the following is a specification:

My invention relates to improvements in automatic steam-hammers, whereby the intensity Of blow may be diminished without a corresponding decrease in the number of blows struck in a given time.

In direct-acting steam-hammers, where the steam is admitted automatically below the pistons to raise the hammer, and then is admitted above the piston to drive it down, the maximum intensity of blow is Obtained with the greatest freedom of exhaust below the piston, so that the weight of the hammer, plus the steam pressure above the piston, shall act to produce a blow with the least resistance from the escaping steam below the piston.v With this freedom of action the greatest speed is also Obtained.` To diminish the force of the blow by diminishing the influx of steam also diminishes the rapidity of the strokes.

With some kinds ofwork light quick blows I effect this result by making and discharge the steam through separate passages from the valve, and by arranging a valve in the exhaust-passage which communicates with the end of the cylinder below the piston. By closing this valve in the exhaust the steam is confined below the piston, and the force of the blow is diminished.

In Figure 1, A is a steam-passa ge to upper end of cylinder 5 B, steam-passage kto lower end of cylinder. A and B are corresponding exhaust ports and passages. The valve C has a partition, E, which separates the exhaust in place of allowing it to escape through one common passage, as in ordinary practice. F, Figs. 2 and 3, is a valve or cock which regulates the exhaust-opening Bf, and when closed entirely prevents the escape of steam from below the piston. The valve C, which is here shown, is one of the balanced kind sliding inside a hood or bonnet, D. The hood D is held down by screws S S passing through the steamchest cover. A lever, Gr, controls the valve F, and enables the hammer man to regulate the intensity of the blow by throttling the exhaust.

ing constructed to operate-in Then the steam below the piston is prevented from escaping freely it forms an elasticspring catching the descending hammer and diminishing the force of the blow. At the same time the steam so compressed aids in expedit-l invention the quickness of the lip-stroke'is not diminished, while the force ofthe down-stroke is moderated by the throttledexhaust.V

I am aware that steam-hammers have been arranged with a means of throttling the exhaust, but this throttling was of the exhaust from both ends of the cylinder. My invention contemplates the valve in the exhaust below the piston only.

What I claim as new, and desire to secure by Letters Patent, is-

l. The combination, in an automatic steamhammer, of steam-passages leading from each end of the cylinder, an independent exhaustpassage for each steam-passage, and a valve separating the exhaust-passages, these members being constructed to operate in combination substantially as set forth.

2. The combination, in an automatic steamhammer, of steam-passages leading from each end of the cylinder, independent exhaust-passages, and a throttle-valve regulating the escape of steam from the lower end of the cylinder only, these members being constructed to operate in combination, substantially as set forth.

3. The combination, in an automatic steamhammer, of steam-passages leading from each end of the cylinder, independent exhaust-passages, a main-valve separating said exhaustpassages, and a throttle-valve regulating the exhaust below theI piston, these members becombination, substantially as set forth.

COLEMAN SELLERS.

Witnesses:

THEODORE BERGNER, Jas. C. BROOKS. 

